You can cancel a withdrawal right up until it's sent out to the blockchain. Once the withdrawal has been broadcast to the chain, it can no longer be canceled.
How to cancel the withdrawal or check if you can cancel
As long as the withdrawal hasn't been sent to the blockchain yet, you can cancel it:
On the Cloudbet site, select your profile icon.
Select History.
Select the withdrawal you want to cancel.
Select Cancel withdrawal.
You'll see a message confirming you've canceled your withdrawal.
I can't see the cancel option
If you can't see the cancel option, your withdrawal has been sent to the blockchain, and it can no longer be canceled. At that point, the funds are on their way, and the transaction can't be reversed.